1390255 has 4 divisors (see below), whose sum is σ = 1668312. Its totient is φ = 1112200.

The previous prime is 1390253. The next prime is 1390283. The reversal of 1390255 is 5520931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5520931 = 13 ⋅424687.

It is not a de Polignac number, because 1390255 - 2¹ = 1390253 is a prime.

It is a Duffinian number.

1390255 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139021 + ... + 139030.

It is an arithmetic number, because the mean of its divisors is an integer number (417078).

2^1390255 is an apocalyptic number.

1390255 is a deficient number, since it is larger than the sum of its proper divisors (278057).

1390255 is an equidigital number, since it uses as much as digits as its factorization.

1390255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278056.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 1390255 is about 1179.0907513843. The cubic root of 1390255 is about 111.6087271516.

The spelling of 1390255 in words is "one million, three hundred ninety thousand, two hundred fifty-five".